mapping genes Flashcards
(14 cards)
wat the are Inheritance theories
dominant genes and uniformity
segregation (one allele per gamete
traits are passed independently
what is polyegentic inheritance
multiple genes contribute to one character
what is pleitrophy
1 gene impacts multiple characters eg. frizzle gene- feather, abnormal body temp, higher metabolic rate
what is wrong about mendelian inheritance
genes travel on chromosomes, not their own
what is the chromosomal theory of inheritance
specific genes are found in specific locations of specific chromosomes- carry genetic material. supports menders law inheritance.
what does it mean by wild type
- natural state of organisms. basically how it exists in the wild. deviations from this is a mutation and can no longer be considered a wild type.
why is Thomas Morgan important
confirmed the chromosomal theory of inheritance. he saw a mutation and cross bred for 2 years. proved recessive genes are carriers exist.
what is genetic recombination
outliers. genetic recombination is causing changes.
how do you calculate the recombinant frequency (map distance)
number of recombinants divided by total number of progeny and multiply by 100.
what does recombinant frequency tell us
how often offspring will have a combination of genes. (the closer the more chances) it’s the crossing over between two genes.
what is the unit for genetic maps
centimorgans (cM)
what does a score higher than 50% say in recombinant frequency
genes are unlinked and are on different chromosomes or at least different sited of chromosomes.
what is chiasma
there’s usually 5 among a chromosome.
when figuring out the link maps, what happens if the distance between two tihnigs don’t add up
due to double crossing over event. if this happens, add the sum of the smaller units.
